A knurling tool which I ordered arrived this week. This is this project’s turning point. I can now straighten out each valve guide and proceed to lap the original valves from this vehicle into the replacement head. Here’s the tool demonstratively placed into a valve guide. I’ll do another photo session under better lighting, tomorrow morning, when the sun hits my window:
I’ll be starting from the combustion chamber’s side, as pictured, because of how these guides typically wear, taking the brunt of axial pressure at the top where the rocker arms move across the valve’s stem, leaving an eccentricly-worn cone. Starting out where the guide is least worn will guarantee that the tool gets aimed through the guide’s center.
The tool was simply placed into that guide, without beginning to turn it. It stopped somewhere in the middle of the tool’s threads, indicating that the 7.1 mm choice was appropriate. For guides that are worn to higher severity, knurling tools are available from this company in also 7.2 mm and 7.3 mm increments.
Even though the price is set in U.S. $s, I was able to pay in €s, having dealt directly with the company. They were very helpful and patient with initial payment difficulties which had to do only with my bank’s procedural methods of which I needed to visit the nearest bank in person for getting a personal tutorial on how they set up international payments in general, given that chat bots and cryptic website designs posed obstacles to those who don’t have programmer mentalities.
They catalog a variety of engine rebuilding tools. I highly recommend them, especially given that these prices are comparitively modest